US3014424A - Shaped explosive charge - Google Patents

Shaped explosive charge Download PDF

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Publication number
US3014424A
US3014424A US725404A US72540458A US3014424A US 3014424 A US3014424 A US 3014424A US 725404 A US725404 A US 725404A US 72540458 A US72540458 A US 72540458A US 3014424 A US3014424 A US 3014424A
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US
United States
Prior art keywords
charge
lining
casing
charges
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US725404A
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English (en)
Inventor
Delacour Jacques
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Services Petroliers Schlumberger SA
Original Assignee
Societe de Prospection Electrique Schlumberger SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe de Prospection Electrique Schlumberger SA filed Critical Societe de Prospection Electrique Schlumberger SA
Application granted granted Critical
Publication of US3014424A publication Critical patent/US3014424A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/028—Shaped or hollow charges characterised by the form of the liner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0042—Reinforcements made of synthetic materials
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/116—Gun or shaped-charge perforators
    • E21B43/117—Shaped-charge perforators

Definitions

  • the present invention has for its object improvements in shaped charges of the type used for the perforation of walls and chiefly in those which are used for perforating the casing extending along the inner wall of a borehole together with the concrete, if any, filling the back of the casing and the geological strata extending beyond said concrete.
  • shaped charges used for such perforations normally include on their front surface a generally metallic lining, the purpose of which is to produce a perforating jet.
  • the detonating wave propagated inside the explosive charge has for its effect to break up the lining and to make it collapse in the direction of the axis of said charge by imparting to a section of said lining a speed which is directed along said axis and which may be substantially higher than the speed of the detonation wave.
  • the actual substance forming the lining assumes a very high speed and forms the perforating jet. Consequently, the conditions governing the formation of said jet have a bearing on its perforating effect.
  • FIG. 1 designates a bore-hole filled with a boring fluid 2 and provided with a casing 3.
  • the numeral 4 designates the support for the perforating apparatus carrying the different shaped charges 5, 5.
  • FIG. 2 illustrates this latter case.
  • a bore-hole 1 is filled with a boring liquid 2 and is provided with a casing 3 which it is desired to perforate at predetermined points.
  • the bore-hole encloses the tubing 6, the diameter of which is, as well known in the art,
  • the present invention has for its object to remove the drawback arising from this condition and to produce shaped charges the efiiciency of which is as independent as possible of the range, so that the efficiency of said charges may remain substantially the same, whatever the operative range may be within the limits of use corresponding to practical conditions.
  • Said invention relies on the fact that the actual speed of each of the elements of the jet depends on several factor, provided all other conditions remain unaltered. Among these factors is the angular slope of the section of the lining which is to form said element, with respect to the axis of the charge and/ or the surface of the casing defining the outer surface of the explosive charge. Another factor is the distance between said element and said axis.
  • the angle considered vary as a function of the distance from the axis of the corresponding element of-the lining.
  • a lining constituted by a flaring surface is used.
  • it is a surface of revolution the generating line of which is constituted by a curve having two concave sections.
  • the concavity of the line is directed outwardly with reference to the axis of revolution in the vicinity of the apex of the lining and towards the axis for the points nearer the base of the lining, the slope of the generating line with reference to the axis of the charge and/or with reference to the outer casing of the charge and the curvature of said generating line at each point being suitably selected to this end.
  • FIGS. 1 and 2 are diagrammatic explanatory showings of the position of the shaped charges in a bore-hole, as described hereinabove.
  • FIG. 3 shows one preferred embodiment of the improved shaped charge to be used for the purpose referred to.
  • FIG. 3 designates the outer casing of the shaped charge, said casing being provided at its rear end with a 3 port 8 adapted, as well known per se, to contain ignition means which are not illustrated.
  • Reference numeral 9 designates the explosive charge and 10 the metal lining for said charge, said lining assuming, according to the invention, the shape of a surface of revolution designed in the manner described. Designating by D, the diameter of the complete charge, the radius of curvature r of the generating line in the vicinity of the apex should be preferably comprised between 0.2 and 0.5 D while the angle a defining the slope of said generating'line at the point at which it meets the inner end of the lining 10 should range preferably between 10 and 30.
  • the radius of curvature r; of the generating line near the outer end or base of the lining it should be preferably of the same magnitude as the radius in the first described section of the charge while the angle ⁇ 9 of the generating line with the outer wall of the casing of the charge ranges preferably between 10 and 40.
  • the charge casing is cylindrical but this is obviously not essential and the casing may assume a frusto conical shape the apical angle of which is more or less marked. The surface of such a frustocone may furthermore converge towards the front or towards the rear of the shaped charge as desired.
  • a shaped charge for producing a perforating jet of substantially constant characteristics over its intended operative range comprising an explosive charge having a rearmost portion, lateral side portions and a front surface having a hollow depression positioned therein uniformly about a longitudinal axis of said charge, an outer casing having an inner surface enclosing the charge laterally and rearwardly, and a rigid lining extending over said front surface including said hollow depression and being comprised of a substantially flat transverse inner portion seated about said axis at the bottom of said depression and a generally outwardly flaring shape surrounding said axis of the charge and defined by a surface of revolution around the axis of the charge extending from said fiat inner portion to said inner surface of said casing, the generating line of said surface being substantially continuously curved with a double curvature consisting of two concave sections, the concavity, of a first one of said sections adjacent said flat inner portion of the lining being directed outwardly with reference to the axis of the charge and the concavity of

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Geophysics And Detection Of Objects (AREA)
US725404A 1957-04-01 1958-03-31 Shaped explosive charge Expired - Lifetime US3014424A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1170520T 1957-04-01

Publications (1)

Publication Number Publication Date
US3014424A true US3014424A (en) 1961-12-26

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ID=9657104

Family Applications (1)

Application Number Title Priority Date Filing Date
US725404A Expired - Lifetime US3014424A (en) 1957-04-01 1958-03-31 Shaped explosive charge

Country Status (6)

Country Link
US (1) US3014424A (xx)
BE (1) BE565361A (xx)
CH (1) CH345828A (xx)
DE (1) DE1068645B (xx)
FR (1) FR1170520A (xx)
GB (1) GB883664A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150204640A1 (en) * 2012-11-30 2015-07-23 Raytheon Company Penetrating warhead and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2410244A1 (fr) * 1977-11-25 1979-06-22 Serat Perfectionnements aux charges creuses
SE8200194L (sv) * 1982-01-15 1983-07-16 Bofors Ab Laddning
FR2569473B1 (fr) * 1984-08-21 1987-10-23 Realisa Applic Techni Et Perfectionnements apportes aux charges creuses
US6305289B1 (en) * 1998-09-30 2001-10-23 Western Atlas International, Inc. Shaped charge for large diameter perforations

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1022472A (fr) * 1950-07-25 1953-03-05 Soc Tech De Rech Ind Perfectionnements aux charges creuses pour engins explosifs
US2782715A (en) * 1951-10-05 1957-02-26 Borg Warner Well perforator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1022472A (fr) * 1950-07-25 1953-03-05 Soc Tech De Rech Ind Perfectionnements aux charges creuses pour engins explosifs
US2782715A (en) * 1951-10-05 1957-02-26 Borg Warner Well perforator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150204640A1 (en) * 2012-11-30 2015-07-23 Raytheon Company Penetrating warhead and method
US9103636B1 (en) * 2012-11-30 2015-08-11 Raytheon Company Penetrating warhead and method

Also Published As

Publication number Publication date
GB883664A (en) 1961-12-06
DE1068645B (de) 1959-11-12
BE565361A (xx)
CH345828A (fr) 1960-04-15
FR1170520A (fr) 1959-01-15

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